package org.zpengblog.cosdemo.qrcode;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;

/**
 * 生成二维码工具类.
 *
 * @author linzp
 * @version 1.0.0
 * CreateDate 2021/1/25 16:52
 */
public class QrCodeUtils {

    //编码
    private static final String CHARSET = "utf-8";

    private static final String FORMAT_NAME = "PNG";
    // 二维码尺寸
    private static final int QRCODE_SIZE = 430;
    // LOGO宽度
    private static final int WIDTH = 60;
    // LOGO高度
    private static final int HEIGHT = 60;

    // 二维码绘制高度偏移量，留出空间写文字描述二维码信息
    private static final int OFFSET_HEIGHT = 25;

    /**
     * 生成二维码
     *
     * @param content      扫描成功的内容
     * @param imgPath      生成二维码的路径
     * @param needCompress 是否需要压缩
     * @return
     * @throws Exception
     */
    private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
        //等同于hashmap,hashtable是线程安全的
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);

        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        if (imgPath == null || "".equals(imgPath)) {
            return drawDetailForQR(image, "SD55870172", false);
        }
        // 插入图片
        QrCodeUtils.insertImage(image, imgPath, needCompress);
        return image;
    }

    /**
     * 插入图片
     *
     * @param source
     * @param imgPath      嵌入二维码的图片路径
     * @param needCompress 是否需要压缩
     * @throws Exception
     */
    private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
        File file = new File(imgPath);
        if (!file.exists()) {
            return;
        }
        Image src = ImageIO.read(new File(imgPath));
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        //压缩LOGO
        if (needCompress) {
            if (width > WIDTH) {
                width = WIDTH;
            }
            if (height > HEIGHT) {
                height = HEIGHT;
            }
            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            // 绘制缩小后的图
            g.drawImage(image, 0, 0, null);
            g.dispose();
            src = image;
        }
        // 插入LOGO
        Graphics2D graph = source.createGraphics();
        int x = (QRCODE_SIZE - width) / 2;
        int y = (QRCODE_SIZE - height) / 2;
        graph.drawImage(src, x, y, width, height, null);
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }

    /**
     * 绘制二维码描述信息.
     *
     * @param source
     * @param content      描述内容
     * @param needCompress 是否需要压缩
     * @throws Exception
     */
    private static BufferedImage drawDetailForQR(BufferedImage source, String content, boolean needCompress) throws Exception {
//        // 插入LOGO
//        Graphics2D graph = source.createGraphics();
//        System.out.println("绘制文字啦");
//        Shape shape = new RoundRectangle2D.Float(0, OFFSET_HEIGHT, QRCODE_SIZE, OFFSET_HEIGHT, 0, 0);
//        graph.setStroke(new BasicStroke(3f));
//        graph.draw(shape);
//        Font font=new Font("宋体", Font.PLAIN,25);
//        graph.setColor(Color.yellow);
//        graph.setFont(font);
//        graph.drawString("QWERQWERQWERQWE", 0, OFFSET_HEIGHT);
//        graph.dispose();
        //新建模板图片
        BufferedImage bufferedImage = new BufferedImage(QRCODE_SIZE, QRCODE_SIZE + OFFSET_HEIGHT, BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics = bufferedImage.createGraphics();
        //绘制二维码标题
        graphics.setColor(Color.white); //白色
        graphics.fillRect(0, 0, QRCODE_SIZE, OFFSET_HEIGHT);
        //绘制描述信息
        Font font=new Font("黑体", Font.PLAIN,20);
        graphics.setColor(Color.black);
        graphics.setFont(font);
        graphics.drawString("编号："+content, 20, OFFSET_HEIGHT-2);

        //绘制二维码
        graphics.drawImage(source, 0, OFFSET_HEIGHT, QRCODE_SIZE, QRCODE_SIZE, null);
        graphics.dispose();
        return bufferedImage;
    }

    /**
     * 生成二维码
     *
     * @param content      扫描成功的内容
     * @param imgPath      嵌入二维码的图片路径
     * @param destPath     生成之后二维码路径
     * @param needCompress 是否需要压缩
     * @throws Exception
     */
    public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
        BufferedImage image = QrCodeUtils.createImage(content, imgPath, needCompress);
        mkdirs(destPath);
        ImageIO.write(image, FORMAT_NAME, new File(destPath));
    }

    /**
     * 生成二维码
     *
     * @param content      扫描成功的内容
     * @param imgPath      嵌入二维码的图片路径
     * @param needCompress 是否需要压缩
     * @return
     * @throws Exception
     */
    public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {
        BufferedImage image = QrCodeUtils.createImage(content, imgPath, needCompress);
        return image;
    }

    /**
     * @param content  扫描成功的内容
     * @param imgPath  嵌入二维码的图片路径
     * @param destPath 生成之后二维码路径
     * @throws Exception
     */
    public static void encode(String content, String imgPath, String destPath) throws Exception {
        QrCodeUtils.encode(content, imgPath, destPath, false);
    }

    /**
     * @param content  扫描成功的内容
     * @param destPath 生成之后二维码路径
     * @throws Exception
     */
    public static void encode(String content, String destPath) throws Exception {
        QrCodeUtils.encode(content, null, destPath, false);
    }

    /**
     * @param content      扫描成功的内容
     * @param imgPath      嵌入二维码的图片路径
     * @param output       输出流
     * @param needCompress 是否需要压缩
     * @throws Exception
     */
    public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)
            throws Exception {
        BufferedImage image = QrCodeUtils.createImage(content, imgPath, needCompress);
        ImageIO.write(image, FORMAT_NAME, output);
    }

    /**
     * @param content 扫描成功的内容
     * @param output  输出流
     * @throws Exception
     */
    public static void encode(String content, OutputStream output) throws Exception {
        QrCodeUtils.encode(content, null, output, false);
    }

    /**
     * 对二维码进行解码
     *
     * @param file 二维码路径+二维码名称
     * @return
     * @throws Exception
     */
    public static String decode(File file) throws Exception {
        BufferedImage image;
        image = ImageIO.read(file);
        if (image == null) {
            return null;
        }
        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
        Result result;
        Hashtable hints = new Hashtable();
        hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
        result = new MultiFormatReader().decode(bitmap, hints);
        String resultStr = result.getText();
        return resultStr;
    }

    /**
     * 对二维码进行解码
     *
     * @param path 二维码路径+二维码名称
     * @return
     * @throws Exception
     */
    public static String decode(String path) throws Exception {
        return QrCodeUtils.decode(new File(path));
    }

    /**
     * 创建文件夹
     *
     * @param destPath 文件夹路径
     */
    public static void mkdirs(String destPath) {
        File file = new File(destPath);
        // 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
        if (!file.exists() && !file.isDirectory()) {
            file.mkdirs();
        }
    }
}
